CN1913504B

CN1913504B - Route path control method, system and device

Info

Publication number: CN1913504B
Application number: CN2005100898345A
Authority: CN
Inventors: 朱东铭; 段小琴; 张海
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-08-08
Filing date: 2005-08-08
Publication date: 2010-12-08
Anticipated expiration: 2025-08-08
Also published as: CN1913504A

Abstract

This invention provides a control method , a system and a device for routing paths including: an applied server determines the network entity in the IMB domain corresponding to a call needing to be routed to the IMB domain from the circuit exchange domain and provides the determined network entity in the IMB domain to that in the circuit exchange domain, which routes said call to the entity in the IMB domain. In this invention, the entity in the circuit exchange domain can route calls in it to the near entity in the IMB domain to make the DMT load path between the circuit exchange domain and the IMB domain the shortest. When this invention is used in a plan of static anchor points, it reduces the DTM load bypass path introduced in the plan so as to increase the usability of the plan.

Description

A kind of route path control method, system and device

Technical field

The present invention relates to the network communications technology field, be specifically related to a kind of route path control method, system and device.

Background technology

From 3GPP R5 (the 3rd Generation Partnership Project 3rd Generation Partnership Project) stage, UMTS (universal mobile telecommunications system) core net is divided into CS (circuit switching), PS (packet switching) and three subsystems of IMS (IP Multimedia System).

CS territory (Circuit Switched Domain circuit commutative field) is used for providing to the user connection of Circuit Service.The CS territory mainly comprises: MSC (MSC Server/CS-MGW, Mobile Switch CenterServer/CS-Media GateWay, Mobile Switching Center Server/circuit domain-media gateway), GMSC (Gateway MSC gateway MSC) and IWF (InterWorking Function, IWF).Wherein, MSC finishes the exchange and the signaling controlled function of circuit switched type business; GMSC is the MSC that finishes mobile subscriber's routing addressing function in a certain network, can close with MSC if set up separately; IWF and MSC are closely related, finish the signaling translation function between PLMN (public land mobile net) and ISDN (integrated services digital network), PSTN (public telephone switching network), PDN (Packet Data Network packet data network), thereby the realization network interworking, the concrete function of IWF is closely related with the kind of professional and network.

PS territory (Packet Switched Domain) is used for providing to the user connection of packet-type business, and the PS territory mainly comprises: GSN (GPRS Support Node), BG (borde gateway), HLR/AuC (Home Location Register/authentication center), VLR (VLR Visitor Location Register), EIR (equipment identity register), MSC etc.Wherein, GSN finishes the transmission of Packet Service user's grouping bag, GSN comprises SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node), SGSN provides being connected of core net and wireless access system BSS, RNS, finish the functions such as mobile management, session management of multicomponent data business, with management MS moving and communication service in the mobile network; GGSN is the interface between mobile communication system and other public data network, and simultaneously, GGSN also has the function of inquiring position information.In addition, SGSN and GGSN all provide charge information.BG be used to finish two between GPRS network intercommunication, guarantee the fail safe of network interworking.HLR is used to finish the management of user contracting data and positional information, user contracting data such as MSISDN, IMSI, PDP ADDRESS, signatory telecommunication service and supplementary service and the professional scope of application thereof etc., positional information such as MSRN, MSC/VLR number, SGSN number, GMLC etc.AUC is mainly used in storage user's authentication arithmetic and key.VLR is used to handle the various data messages of visitor.EIR is used to store customer equipment identification IMEI information.

IMS is a subsystem that is superimposed upon in the WCDMA network that increases in the 3GPP R5 stage on the existing packet domain, adopt the bearer path of packet domain for its upper strata control signaling and media delivery, and introduce Session Initiation Protocol as professional control protocol, utilize simple, the easy expansion of SIP, media combination characteristics easily, by business control is separated with carrying control, provide abundant multimedia service.Major function entity among the IMS comprise functions such as control user registration, session control conversation control entity CSCF, provide miscellaneous service logic control function application server AS, manage the home subscriber server HSS of user contracting data concentratedly and be used to realize MGCF/IM-MGW (MGCF) with the circuit switching net interconnecting.The user is by current location agent node P-CSCF access IMS, and session and professional triggering control reach with the business control of AS and then finished by the home domain service node S-CSCF of its registered place alternately.

HSS in the IMS system is the superset of HLR, can compatible HLR on the function, but because factors such as networking process, HSS and CS/PS HLR adopt situation about setting up separately probably in the concrete networking.

The IMS framework of 3GPP standard definition has solved the roam charge that the required solution of multimedia service is provided under the IP carrying comprehensively, QoS (service quality), but the problems of operation that safety guarantee etc. are crucial, its framework and thinking have obtained industry and have generally acknowledged, 3GPP2, TISPAN has all carried out the definition of corresponding IP multi-media network framework and business system with the 3GPP model as basis and reference, 3GPP has also begun to insert and UMTS intercommunication such as I-WLAN (Interworking of WLAN at WLAN (WLAN (wireless local area network)), the WLAN intercommunication), fixed broadband inserts IMS such as FBI (Fixed Broadband access to IMS, fixed broadband inserts IMS) and towards the all-IP net such as the AIPN subject studies such as (All-IP Network complete IP networks) of multiple access technology, the user can signatory insert IMS by single multimode terminal or polytype different terminals via the Access Network of different access technologies according to it, with what obtain to unify, the multimedia service that comprises VoIP (Voice over IP, IP-based voice) business etc.

Because the business platform of IMS framework can provide IP-based speech business equally, it is the VoIP business, and operator can at based on the speech business in CS territory with implement different charging rates respectively based on the speech business in IMS territory, therefore, for unfounded call/session still, need select the route of called subscriber between CS territory or IMS territory neatly according to the routing policy of operator and user's preference setting; And, because operator also can provide respectively in different regions based on the speech business in CS territory or based on the speech business in IMS territory, like this, because user's mobility, for the call/session of having set up, when the user speech business takes place in CS territory and IMS territory is switched, need to guarantee the continuity of call/session, to guarantee that speech business is two seamlessly transitting of same area not.

At present, 3GPP has just passed through research CS calling and has passed through IP-CAN (IP-ConnectivityAccess Network IP, connective access network) insert the work problem of business continuance problem between the VoIP business that IMS provides, the emphasis of research contents concentrates on called route control and switches two aspects.

At present 3GPP has proposed a kind of calling controlling schemes of static anchor point (IMS control static anchoring) of IMS control, to solve in two territories, as CS territory and IMS territory, between the problem switched.The core concept of this scheme is, for no matter from the CS territory or the call/session initiated of IMS territory, all this call/session is toggled to the AS (Application Server, application server) in the IMS territory, call/session is carried out grappling control (Anchoring control) by this AS.Like this, follow-uply no matter take place between CS territory to the territory in IMS territory to switch or the IMS territory takes place switches between the territory in CS territory, all the call/session of grappling is carried out follow-up switching controls and handle by this AS.

Since among the IMS session control mode itself just can be very easily in call path anchor point AS of insertion session is controlled, promptly make session be toggled to AS by defining iFC.And in call path, insert an anchor point AS not too easily for the calling control mode in CS territory itself, therefore the calling of initiating at the CS territory is toggled to the process of anchor point AS, the 3GPP standard has been described multiple scheme at present: the initial call of initiating when being the CS territory for Calling Side, promptly receiving the calling of initiating behind the call setup message of UE for Calling Side VMSC, can there be the control of network side route promptly to use the CAMEL scheme, USSD and Notify scheme are promptly used in control with the end side route, and two kinds of control models route the call to anchor point AS.The initial call of initiating when being the CS territory for callee side, the GMSC that is called home network is after receiving the calling that comes from Calling Side, according to the calling that GMSC initiates after to the called party information analysis, can use CAMEL scheme and signaling catching scheme to route the call to anchor point AS.

This function that initial call is routed to anchor point AS is called DRF (Domain Routing Faction inter-domain routing function) function, for the CS territory, entity with DRF function can be gsmSCF, and for the IMS territory, the entity with DRF function can be an AS.Routing decision entity gsmSCF in the CS territory can be arranged in same physical entity with the routing decision entity A S in the IMS territory.

The grappling controlled function of above-mentioned AS is used to realize that the cardinal principle of switching between the territory is, when calling is initially set up, as the calling of UE (A) initiation at UE (B), insert an anchor point AS by gsmSCF or the AS with DRF function in the call path of Calling Side UE (A), this AS enables the B2BUA function and is divided into AS in order to the calling with Calling Side and stops section and AS and initiate sections two sections.AS termination section is the call leg between UE (A)-AS, and AS initiation section is the call leg between the AS-UE (B).Follow-up in the process of calling out, UE (A ') detect when switching condition satisfies between the territory, wish that will the current calling of carrying out switching to UE (A ') from UE (A) carries out follow-up calling and control, UE this moment (A ') then initiates a new calling at the AS that grappling control is carried out in current calling, AS is after receiving this calling, judge in the time of to carry out switching between the territory, then AS initiates the new calling of initiating of UE (A ') and AS section to continue, discharge the calling of AS termination section then, like this, under the control of anchor point AS, make continuing that UE (A ') and same UE (B) carried out calling out, discharge the call leg between previous UE (A)-AS, finished UE (A) to the switching between the UE (A ').This grappling control is carried out in calling, and the function of carrying out hand-off process between the territory when switch taking place is called DTF (forwarding function between Domain Transfer Function territory) function, under static anchor point scheme, the entity with DTF function is an AS in the IMS territory.

Routing decision point gsmSCF or AS with DRF function can be arranged in same physical entity with the AS with DTF function.

Here, UE (A) can be the terminal in CS territory, and UE (A ') can be the terminal in IMS territory, switches to the calling of UE (A ') by UE (A), the same calling that has realized user A from the CS territory to the call continuity the IMS territory.

Same, when calling is initially set up, can in the call path of Calling Side UE (B), insert an anchor point AS equally, in order to the calling control of switching between the territory of realizing follow-up callee side.

When accompanying drawing 1 made a call as caller for the user in CS territory, under the network side route control model, i.e. the calling of using CAMEL mechanism to initiate in the CS territory was toggled to the flow chart that AS carries out anchor point.

Among Fig. 1, make a call at step 1-1, the UE that is registered to VMSC (Visited Mobile Switch Center Visited Mobile Switching Center).

Calling is triggered among the gsmSCF with DRF function according to the CAMEL Subscription Information of Calling Side to step 1-2, VMSC.

Generate a routing number IMRN (IMS Routing Number) who points to the AS in the IMS territory to step 1-3, gsmSCF with DRF function, make VMSC route the call on this DTF according to this routing number with DTF function.GsmSCF with DRF function can construct IMRN by append methods such as Call Reference Number behind the identification information DTF of DTF PSI (DTF Public Service Identities DTF public service identity), and the gsmSCF that has the DRF function then is handed down to VMSC by CAMEL connect message with IMRN.

Route the call to the MGCF (MGCF) in the IMS network of calling subscriber ownership according to IMRN to step 1-4, VMSC.

The called party information of judging in the IAM message to step 1-5, MGCF is to point to the IMRN of the AS with DTF function, then sends INVITE to I-CSCF, and the called party information Request-URI in this message is the TEL URI form of IMRN.

Inquire about routing iinformation according to Request-URI to HSS to step 1-6, I-CSCF, obtain the AS address information that is associated with this IMRN, promptly have the AS address information of DTF function, I-CSCF transmits INVITE to the AS with DTF function then.Here, can return AS information according to the IMRN that comprises DTF PSI information, in HSS, need to dispose DTF PSI data with corresponding relation with AS address information of this DTF function with DTF function in correspondence in order to support HSS.

To step 1-7, have called party information that the AS of DTF function receives and comprise the session of IMRN of DTF PSI information after, grappling control is carried out in session, promptly trigger B2BUA (back-to-back user agent) function, stop AS and receive session, initiate a new session at former called party information then, the AS that promptly has the DTF function is by obtaining the S-CSCF information of calling subscriber's side, then with the Sh interface of HSS, will talk about and route to S-CSCF, and will talk about by this S-CSCF and to route to former callee side.

Here, route the call in the process of former callee side at S-CSCF, when former called party information is the Tel-URI form, S-CSCF carries out ENUM DNS (E.164Number Domain Name System E.164 domain name converting system) translation function, if original called party number can be converted to SIP URI form, then follow-up calling route is carried out in the IMS territory, otherwise, S-CSCF routes the call to the BGCF (Breakout Gateway Control Function borde gateway controlled function) in this IMS territory, to call out finally by BGCF and to route to PSTN (public switched telephone network (PSTN)) or CS territory via MGCF, at last by PSFN or CS territory with call proceeding to called.When the AS with DTF function enabled the B2BUA function, for the session that stops at DTF with in the new session of initiating of DTF, DTF controlled to switch between the territory that may initiate subsequent user all to its maintenance state.

Because the calling subscriber visits the CS territory on ground and not necessarily supports CAMEL, therefore need consider that other alternative route the call to AS, provide in the standard of 3GPP at present under the end side route control model based on USSD (Unstructured Supplementary Service Data unstructured supplementary data traffic) with based on two kinds of mechanism of Notify (notice).Wherein, USSD mechanism is applied to UE and is not registered to IMS territory, UE when VMSC makes a call, that the called address information in the call signaling is carried is the DTF PSI that points to the AS with DTF function, thereby VMSC routes the call to the AS that has the DTF function in the IMS territory via MGCF.And real called party information, number information as UE (B), be in the USSD signaling that the gsmSCF with DRF function sends, to carry by UE, like this, after the gsmSCF with DRF function receives the USSD signaling, carry out alternately with AS with DTF function, the real called party information of its current session that receives of notice DTF, it is the number information that carries UE (B) in the USSD signaling, thereby the AS with DTF function carries out grappling to the calling that the UE that receives initiates, be that AS starts the B2BUA function, stop AS and receive session, initiate a new session at former called party information then, the former called party information here obtains from the USSD signaling that the gsmSCF with DRF function receives.Subsequent treatment is as described in the step 7 of Fig. 1, and the former called party information in the new session of initiating according to AS continues after will talking about and routing to the called subscriber.Notify mechanism is applied to UE and has been registered to IMS territory, UE when VMSC makes a call, called address information in the call signaling is pointed to the DTF PSI of the AS with DTF function when carrying, thereby VMSC routes the call to the AS that has the DTF function in the IMS territory via MGCF.And real called party information, number information as UE (B), be that UE by the current IMS of being registered to territory carries in the SIP Notify signaling that the AS with DRF function sends, like this, after the AS with DRF function receives SIP Notify signaling, carry out alternately with AS with DTF function, the real called party information of its current session that receives of notice DTF, it is the number information that carries UE (B) in the SIP Notify signaling, thereby the AS with DTF function carries out grappling to the calling that the UE that receives initiates, be that AS starts the B2BUA function, stop AS and receive session, initiate a new session at former called party information then, the former called party information here obtains from the SIP Notify signaling that the AS with DRF function receives.Subsequent treatment is as described in the step 7 of Fig. 1, and the former called party information in the new session of initiating according to AS continues after will talking about and routing to the called subscriber.

When accompanying drawing 2 made a call for the user in CS territory does caller, the calling that will initiate based on USSD mechanism routed to the flow chart that AS carries out anchor point.

Make a call at step 2-1, UE, called party information in the calling is for pointing to the DTF PSI of the AS with DTF function, and also carry in this call information one can unique identification UE and this have the Call Reference Number of session between the AS of DTF function, this Call Reference Number can be carried in the called address information, as append after called party information DTF PSI, or be carried in the called party subaddress information.

After the Call proceeding that receives the MSC transmission, under application model, start the USSD operation to step 2-2, UE, send the USSD signaling to gsmSCF with DRF function.Carry real called party information in this USSD signaling, by whistle information and other call-related informations.

Receive the USSD signaling of UE transmission to step 2-3, VMSC after, transmit this USSD signaling to HLR, HLR transmits this USSD signaling to the gsmSCF with DTF function then.

To step 2-4, before VMSC distributes the required Radio Resource of calling, be DTFPSI according to called party information, the MGCF of VMSC in the IMS network of calling subscriber's ownership sends IAM message, and the calling that receives among the step 2-1 is routed to the IMS territory.

The called party information of judging in the IAM message to step 2-5, MGCF is to point to the DTF PSI of the AS with DTF function, then sends INVITE to I-CSCF, and the called party information Request-URI in this message is the TEL URI form of DTF PSI.

To step 2-6, with step 1-6.

To step 2-7, have called party information that the AS of DTF function receives and be the session of DTF PSI information after, after the gsmSCF that has the DRF function simultaneously receives the USSD signaling, gsmSCF with DRF function carries out alternately with the AS with DTF function, the real called party information of its current session that receives of notice DTF, be to carry the number information of UE (B) in the USSD signaling, thereby the AS with DTF function carry out grappling to the calling that the UE that receives initiates.Subsequent treatment is with step 1-7.

When accompanying drawing 3 made a call for the user in CS territory does caller, the calling that the IMS terminal utilizes the Notify mechanism in the IMS territory to initiate routed to the flow chart that AS carries out anchor point.

At step 3-1, with step 2-1.

After the Call proceeding that receives the VMSC transmission, the UE under the IMS territory sends SIP Noitify signaling to having DRF function AS to step 3-2, UE.Carry real called party information in this SIP Notify signaling, by whistle information and other call-related informations.

To step 3-3, with step 2-4.

To step 3-4, with step 2-5

To step 3-5, with step 1-6.

To step 3-6, have called party information that the AS of DTF function receives and be the session of DTF PSI information after, after the AS that has the DRF function simultaneously receives the SIPNotify signaling, AS with DRF function carries out alternately with the AS with DTF function, the real called party information of its current session that receives of notice DTF, be to carry the number information of UE (B) in the SIP Notify signaling, thereby the AS with DTF function carry out grappling to the calling that the UE that receives initiates.Subsequent treatment is with step 1-7.

As preceding analysis, the initial call of initiating when being the CS territory for callee side, the GMSC that is called home network according to the calling that GMSC initiates after to the called party information analysis, can use CAMEL scheme and signaling catching scheme to route the call to anchor point AS after receiving the calling that comes from Calling Side.Wherein the CAMEL scheme is applicable to that GMSC supports that the signaling catching scheme is applicable to that GMSC can not support under the situation of CAMEL ability under the situation of CAMEL ability.Accompanying drawing 4, uses CAMEL mechanism will receive the calling that comes from Calling Side and is toggled to the flow chart that anchor point AS carries out grappling when called for the user in CS territory does in the CS territory.

When the MSISDN of called party information belongs to the CS territory at step 4-1, in calling out,, when carrying out called route, route the call to GMSC in the CS territory or the calling initiated of PSTN.

To step 4-2, GMSC after receiving the calling that comes from Calling Side, called party information is analyzed, GMSC sends SRI message to obtain called subscriber's routing iinformation to HLR then, because this GMSC supports the CAMEL ability, so GMSC sends the CAMEL support information that carries relevant parameters indication GMSC in the SRI message to HLR.HLR returns the callee side CAMEL Subscription Information T-CSI of indication user for CS-IMS user.

Trigger the CAMEL business to step 4-3, GMSC according to the T-CSI that receives, send IDP message, the route indication of request DRF to gsmSCF with DRF function.

Obtain current data and the state in user IMS territory to step 4-4, gsmSCF with DRF function from HSS.

Obtain current data and the state in user CS territory to step 4-5, gsmSCF with DRF function from HLR.

Generate a routing number IMRN (IMS Routing Number) who points to the AS in the IMS territory to step 4-6, gsmSCF with DRF function, make GMSC route the call on this DTF according to this routing number with DTF function.GsmSCF with DRF function can construct IMRN by append methods such as Call Reference Number behind the identification information DTF of DTF PSI (DTF Public Service Identities DTF public service identity), and the gsmSCF that has the DRF function then is handed down to GMSC by CAMEL connect message with IMRN.

Route the call to the MGCF in the IMS network of called subscriber ownership according to IMRN to step 4-7, GMSC.

To step 4-8, with step 1-5.

To step 4-9, with step 1-6.

To step 4-10～step 4-13, have called party information that the AS of DTF function receives and comprise the session of IMRN of DTF PSI information after, grappling control is carried out in session, promptly trigger B2BUA (back-to-back user agent) function, stop AS and receive session, initiate a new session then at former called party information, the AS that promptly has the DTF function is by obtaining the S-CSCF information of called subscriber's side with the Sh interface of HSS, then, will talk about and route to S-CSCF, and will talk about by this S-CSCF and to route to former callee side.

Here, AS with DTF function is by the analysis to former called party information, judging needs will to talk about to route in the CS territory to continue, and what have therefore that the AS of DTF function initiates is the CSRN (CS Routing Number CS territory routing number) of AS based on the Tel-URI form of former called party information structure at the called party information Requested-URI in the new session of former called party information.

Here, route the call in the process of former callee side at S-CSCF, when former called party information is the Tel-URI form, S-CSCF carries out ENUM DNS (E.164Number Domain Name System E.164 domain name converting system) translation function, if original called party number can be converted to SIP URI form, then follow-up calling route is carried out in the IMS territory, otherwise, S-CSCF routes the call to the BGCF (Breakout Gateway Control Function borde gateway controlled function) in this IMS territory, to call out the GMSC that finally routes to the CS territory by BGCF via MGCF, by GMSC that call proceeding is extremely called at last.When the AS with DTF function enabled the B2BUA function, for the session that stops at DTF with in the new session of initiating of DTF, DTF controlled to switch between the territory that may initiate subsequent user all to its maintenance state.

Receive the incoming call IAM message of MGCF to step 4-14, GMSC after, therefrom parse former called subscriber's MSISDN (using the mode of CAMEL business or other switch technology), after based on the MSISDN that parses called party information being analyzed then, GMSC sends SRI message to obtain called subscriber's routing iinformation to HLR, because this GMSC supports the CAMEL ability, so GMSC sends the CAMEL support information that carries relevant parameters indication GMSC in the SRI message to HLR.HLR returns the callee side CAMEL Subscription Information T-CSI of indication user for CS-IMS user.

To step 4-15, with step 4-3.

Judge it to step 4-16, gsmSCF with DRF function and anchor point control has been carried out in this calling, IMRN does not then reallocate, directly issue continue message to GMSC, GMSC continues follow-up calling after receiving continue message, being GMSC sends the routing iinformation (GMSC in the SRI of this transmission message carry restrain T-CSI parameter) of SRI message to obtain the called subscriber to HLR, and the called subscriber's that returns according to HLR of GMSC routing iinformation continues after routing the call to called subscriber's visit VMSC then.

Accompanying drawing 5, uses signaling catching mechanism will receive the calling that comes from Calling Side and is toggled to the flow chart that anchor point AS carries out grappling when called for the user in CS territory does in the CS territory.

At step 5-1, with step 4-1.

To step 5-2, GMSC after receiving the calling that comes from Calling Side, called party information is analyzed, GMSC sends SRI message to obtain called subscriber's routing iinformation to HLR, because this GMSC does not support the CAMEL ability, so GMSC sends the CAMEL support information that can not carry relevant parameters indication GMSC in the SRI message to HLR.Therefore, HLR can not return the indication user to GMSC and be CS-IMS user's callee side CAMEL Subscription Information T-CSI, but directly returns called routing iinformation, thereby call anchor can't have been fixed on the AS that has the DTF function in the IMS territory.In order to make that calling can be toggled to the AS that has the DTF function in the IMS territory before the called routing iinformation that GMSC gets from HLR calls out grappling, between GMSC and HLR, insert signaling catching entity SRF (Signalling Relay Function signaling forwarding capability), this SRF has the DRF function, interception GMSC carries out corresponding intra domain routing policy control and treatment after analyzing to the SRI message of HLR transmission and to this message.

Obtain current data and the state in user IMS territory to step 5-3, SRF with DRF function from HSS.

Obtain current data and the state in user CS territory to step 5-4, SRF with DRF function from HLR.

Generate a routing number IMRN (IMS Routing Number) who points to the AS in the IMS territory to step 5-5, SRF with DRF function, make MSC route the call on this DTF according to this routing number with DTF function.SRF with DRF function can construct IMRN by append methods such as Call Reference Number behind the identification information DTF of DTF PSI (DTF Public Service Identities DTF public service identity), the function that has the SRF imitation HLR of DRF function is then returned SRI-Ack message to GMSC, in this SRI-Ack message IMRN is sent to GMSC as called routing iinformation.

Step 5-6 is with step 4-7; Step 5-7 is with step 1-5; Step 5-8 is with step 1-6; Step 5-9 to step 5-12 with step 4-10 to step 4-13.

Receive the incoming call IAM message of MGCF to step 5-13, GMSC after, can use certain switch technology therefrom to parse former called subscriber's MSISDN, then, after based on the MSISDN that parses called party information being analyzed, GMSC sends SRI message to obtain called subscriber's routing iinformation to HLR.The SRF that this calling is had the DRF function equally tackles, SRF with DRF function judges this calling is handled, then this not being tackled the SRI that gets off analyzes, do not carry out corresponding intra domain routing policy control and treatment, directly transmit this SRI message, and the SRI-Ack forwards that the HLR that it receives is returned is to GMSC to HLR.GMSC continues route the call to called subscriber's visit VMSC according to the routing iinformation of the called subscriber among the SRI-Ack that receives after.

In the calling controlling schemes that proposes at present by the static anchor point (IMS control static anchoring) of IMS control, initiate in the CS territory when calling out, then need the VMSC on the calling caller visit ground from the CS territory that will initiate to route to AS in the caller ownership IMS territory with DTF function, the grappling of being called out by this AS is also carried out switching controls between follow-up possible territory, here, in order to realize that calling with the CS territory routes to the AS with DTF function in the IMS territory, need in the VMSC on caller visit ground and caller ownership IMS territory, set up one section DTM carrying between the MGW under the MGCF control, the DTM carrying of this section foundation is that the route that has therefore produced the DTM carrying is circuitous owing to just introduce for the calling controlling schemes that realizes static anchor point.Same, terminate in the CS territory when calling out, the GMSC of calling from the CS territory that then needs to initiate routes to the AS with DTF function in the called ownership IMS territory, the grappling of being called out by this AS is also carried out switching controls between follow-up possible territory, here, in order to realize that calling with the CS territory routes to the AS with DTF function in the IMS territory, need in GMSC and called ownership IMS territory, set up one section DTM carrying between the MGW under the MGCF control, the DTM of this section foundation carrying is also the time owing to just introduce for the calling controlling schemes that realizes static anchor point, therefore, the route that has produced the DTM carrying is equally made a circulation.

Summary of the invention

The objective of the invention is to, a kind of route path control method, system and device are provided, needs are routed to the routed path control of calling in the CS territory in the IMS territory as route control nearby etc. by application server, optimize the DTM carrying between CS territory and the IMS territory, realized saving the purpose of DTM carrying.

For achieving the above object, a kind of route path control method provided by the invention, for the calling that need route to the IMS territory from circuit commutative field, this method may further comprise the steps:

A, application server are determined the described network entity of calling out in the corresponding IMS territory;

B, the application server network entity in circuit commutative field provides the network entity information in its described IMS territory of determining;

Network entity in c, the described circuit commutative field routes to network entity in the described IMS territory with described calling.

Described need comprising: need the IMS territory, carry out the calling of the circuit commutative field of grappling process from the calling that circuit commutative field routes to the IMS territory.

Described application server is: have the application server of inter-domain routing function in the IMS territory, or have the gsmSCF of inter-domain routing function in the mobile network circuit switching (CS) territory, or have the SRF of inter-domain routing function.

Described step a further comprises:

The MSC of the initiation initial call in a1, the mobile network circuit switching (CS) territory is toggled to described application server according to predetermined trigger mechanism with this calling;

A2, described application server are determined the information that needs route the call to the MGCF in the IMS territory according to predetermined policy.

Initiation initial call in the described mobile network circuit switching (CS) territory is: when Calling Side is the CS territory, VMSC receives the calling initiated behind the call setup message of UE or callee side when being the CS territory, GMSC is after receiving the calling that comes from Calling Side, to the calling of initiating after the called party information analysis;

Described predetermined trigger mechanism is: CAMEL mechanism or USSD mechanism or Notify mechanism or signaling catching mechanism.

Described step a2 specifically comprises:

Described application server obtains the positional information of Calling Side VMSC in the mobile network circuit switching (CS) territory, and determines distance described VMSC nearest MGCF according to strategy nearby; Or

Described application server obtains calling subscriber's current position information in the mobile network circuit switching (CS) territory, and determines the distance described calling subscriber current nearest MGCF of VMSC according to strategy nearby; Or

Described application server obtains the positional information of callee side GMSC in the mobile network circuit switching (CS) territory, and determines the MGCF of described GMSC correspondence according to predetermined strategy nearby.

The step that described application server obtains Calling Side VMSC positional information in the mobile network circuit switching (CS) territory comprises:

Described application server is determined the positional information of Calling Side VMSC in the CS territory according to the MSC address information of carrying in the CAMEL IDP message.

The step that described application server obtains callee side GMSC positional information in the mobile network circuit switching (CS) territory comprises:

Described application server is determined the positional information of callee side GMSC in the mobile network circuit switching (CS) territory according to the MSC address information of carrying in the CAMEL IDP message; Or

Described application server is determined the positional information of callee side GMSC in the mobile network circuit switching (CS) territory according to the MSC address information of carrying in the SRI message.

Described step b specifically comprises:

Described application server is according to described MGCF information structuring IMRN, and it is issued to VMSC/GMSC; Or

Described application server is according to described MGCF information structuring IMRN, and it is issued to UE, and described UE offers described IMRN the VMSC at its current place when making a call.

Described IMRN comprises: MGCF routing iinformation and DTF PSI and call reference number; Or

Described IMRN comprises: MGCF routing iinformation and DTF PSI.

Described step a also comprises:

When the network entity MGCF in the IMS territory that application server is determined did not belong to network entity in this ownership IMS territory, MGCF determined I-CSCF address information in the ownership IMS territory by called party information being carried out ENUM DNS translation function.

The present invention also provides a kind of routed path control system, comprising:

Be positioned at the IMS territory network entity determination module of application server: for the calling that need route to the IMS territory from circuit commutative field, determine calling according to predetermined policy and need route to network entity in the IMS territory, and described IMS territory network entity information is offered routing module;

Be positioned at the routing module of circuit commutative field:, route the call to corresponding entity in the IMS territory according to the IMS territory network entity information that IMS territory network entity determination module provides.

The present invention also provides a kind of application server, be provided with IMS territory network entity determination module in the described application server, for the calling that need route to the IMS territory from circuit commutative field, described IMS territory network entity determination module is determined the network entity of calling out in the IMS territory that needs route to according to predetermined policy, and the network entity information in the described IMS territory is offered network entity in the circuit commutative field.

The present invention also provides a kind of switching center, is arranged in the circuit commutative field, is provided with routing module in the described switching center, and described routing module routes the call to corresponding network entity in the IMS territory according to the IMS territory network entity information that application server provides.

Description by technique scheme as can be known, route to the calling in the CS territory in the IMS territory for needs, application server of the present invention can be controlled from the CS territory to the routed path in IMS territory above-mentioned calling according to routed path demand for control concrete in the network, can make the network entity in the CS territory that the calling in CS territory is routed to network entity in the IMS territory nearby as application server, make the path of the DTM carrying between CS territory and the IMS territory the shortest, thereby saved the DTM carrying, it is circuitous to have reduced possible route; When the present invention is applied to static anchor point scheme under the call continuity problem, effectively reduced the DTM carrying circuitous path of introducing in the static anchor point scheme, improved the practicality of static anchor point scheme; The present invention is applicable to the initial call of initiating when the initial call of initiating when Calling Side is the CS territory and callee side are the CS territory, and can be applicable to multiple calling trigger mechanism; The present invention is by when structure routes to the routing number IMRN in IMS territory with the calling in CS territory, in IMRN, increase the routing iinformation of the network entity MGCF in the IMS territory, as increase the MGCF route prefix, make network entity VMSC in the CS territory and/or GMSC can be easily will call out MGCF, route to the IMS territory by appointment according to the MGCF routing iinformation; Optimized the DTM carrying between CS territory and the IMS territory, the operation cost of having saved network.

Description of drawings

Fig. 1 is the user in CS territory when making a call as caller, and the calling of using CAMEL mechanism to initiate in the CS territory is toggled to the flow chart that AS with DTF function carries out grappling;

Fig. 2 is the user in CS territory when doing caller and making a call, and the calling that will initiate based on USSD mechanism routes to the flow chart that AS with DTF function carries out grappling;

Fig. 3 is the user in CS territory when doing caller and making a call, and the calling that will initiate based on SIP Notify mechanism routes to the flow chart that AS with DTF function carries out grappling;

Fig. 4 is that the user in CS territory does when called, uses CAMEL mechanism that the calling of Incoming is toggled to the flow chart that AS with DTF function carries out grappling in the CS territory;

Fig. 5 is that the user in CS territory does when called, uses signaling catching mechanism that the calling of Incoming is toggled to the flow chart that AS with DTF function carries out grappling in the CS territory;

Fig. 6 is that schematic diagram is optimized in DTM carrying of the present invention;

Fig. 7 is a routed path control system schematic diagram of the present invention.

Embodiment

Calling in circuit commutative field need route to the IMS territory, simultaneously, the network entity that receives the IMS territory of this calling has a plurality of, and when the position that each network entity distributes has nothing in common with each other, if the positional information of the network entity that can make a call according to circuit commutative field is chosen the network entity in the IMS territory that receives this calling nearby, then the calling of circuit commutative field initiation just can route to the IMS territory nearby, shortened the DTM carrying between circuit commutative field and the IMS territory, in the static anchor point scheme under the call continuity problem, if MSC can will call out the MGCF that routes in the IMS territory nearby, then reduced the influence that static anchor point scheme is introduced, promptly reduced the circuitous length of introducing by static anchor point scheme of DTM carrying the DTM carrying.

Therefore, core of the present invention is: for the calling that need route to the IMS territory from circuit commutative field, application server is controlled from circuit commutative field to IMS territory routed path this calling according to predetermined policy, and the network entity that makes network entity in the circuit commutative field will call out from the IMS territory of appointment under the route control of application server routes to the IMS territory.Set routing policy nearby as application server, the positional information of network entity then makes a call in this application server acquisition cuicuit switching domain, judge apart from this circuit commutative field network entity in the nearest IMS territory of network entity that makes a call, then, the application server network entity that makes a call in circuit commutative field provides the routing iinformation of network entity in this IMS territory, makes network entity in the circuit commutative field will call out from the IMS territory network entity of appointment according to the routing iinformation that obtains and routes to the IMS territory nearby.

Circuit commutative field among the present invention not only comprises mobile network's circuit switching (CS) territory, also comprises the PSTN network.

Based on core concept of the present invention, the calling initiated with the circuit commutative field that need carry out static grappling in the IMS territory is that example is further described technical scheme provided by the invention.

When the present invention is applied to static anchor point scheme under the call continuity problem, application server of the present invention is the AS with route controlled function in the IMS territory, the AS that promptly has the DRF function, or be the gsmSCF in the mobile network circuit switching (CS) territory, the gsmSCF that promptly has the DRF function with route controlled function.Network entity in the IMS territory is a plurality of MGCF that are in different region locations.Set a plurality of MGCF that are in different region locations that are provided with in the IMS territory and be respectively MGCF1, MGCF2, MGCF3, MGCF4, as shown in Figure 6.

At first, when the calling in the mobile network circuit switching (CS) territory is toggled to application server by MSC according to predetermined trigger mechanism, application server can trigger the positional information that the information of carrying is determined MSC to calling out according to MSC, like this, application server just can be determined the information that needs route the call to certain MGCF in the IMS territory according to predetermined policy, set routing policy nearby as application server, then application server is determined information apart from the MGCF in the nearest IMS territory, this MSC position according to routing policy nearby, application server makes MSC will call out from the MGCF of appointment according to the routing iinformation that obtains and routes to the IMS territory nearby to the routing iinformation that MSC provides this MGCF then.In Fig. 6, application server is determined the MGCF information nearest apart from the VMSC in the mobile network circuit switching (CS) territory, and promptly MGCF4 information provides the IMRN4 that comprises the MGCF4 route prefix as new called party information to VMSC then.When VMSC analyzes the new called party information that obtains, then can route the call to MGCF4 according to the MGCF4 route prefix information that comprises among the IMRN4.Can find out obviously that from Fig. 6 the present invention has effectively shortened the distance of the DTF carrying between mobile network circuit switching (CS) territory and the IMS territory, optimize DTM carrying route.

It is multiple that above-mentioned application server provides the mode of MGCF routing iinformation to have to MSC, offers MSC as the IMRN that directly will be comprised the MGCF route prefix by application server as new called party information.And for example the IMRN that will comprise the MGCF route prefix by application server offers UE, IMRN is carried to MSC as called party information when making a call by UE.

When above-mentioned application server provides the MGCF routing iinformation to MSC, can provide in this IMS territory and can route to this IMS territory, it is the routing iinformation of MGCF in the IMS territory of called party information DTF PSI ownership, when the positional information of the MGCF that can obtain other IMS territories and corresponding routing iinformation, nearest as judge MSC according to the MSC positional information apart from certain MGCF in other IMS territories, then application server also can provide and can route to other IMS territories, the routing iinformation of MGCF in the IMS territory of promptly non-called party information (DTF PSI) ownership.After the calling in mobile network circuit switching (CS) territory routes to MGCF in other IMS territories, because the MGCF in other IMS territories can not determine the domain name of non-the called party information (DTF PSI) in the IMS territory, therefore MGCF need carry out ENUM DNS conversion to called party information, after converting the DTF PSI of Tel-URI form to SIP URI, determine the address information that this DTF PSI belongs to I-CSCF in the IMS territory according to the domain-name information of SIP URI, route the call to this I-CSCF then.

The calling in mobile network circuit switching (CS) territory can be the initial call of Calling Side initiation in the mobile network circuit switching (CS) territory among the present invention, also can be the initial call of callee side initiation in the mobile network circuit switching (CS) territory, corresponding M SC can be VMSC or GMSC, and the predetermined trigger mechanism of MSC also comprises multiple, as CAMEL mechanism, USSD mechanism, Notify mechanism and signaling catching mechanism etc., be described in detail below in conjunction with accompanying drawing 1 to 5 pairs of multiple implementation methods of the present invention of accompanying drawing.

Method one: among Fig. 1, the calling subscriber's in mobile network circuit switching (CS) territory VMSC is triggered to this calling subscriber's calling when having the gsmSCF of DRF function in the mobile network circuit switching (CS) territory by CAMEL mechanism, its triggering be mobile network circuit switching (CS) territory Calling Side CAMEL Subscription Information.

In step 1-3, gsmSCF with DRF function is that DP2 knows that this CAMEL is the mutual of a Calling Side user alternately by the Detection Point of the triggering among the CAMEL message id P (the initial Detection Point of Initial Detected Point) that receives, and can judge the positional information of VMSC at mobile network circuit switching (CS) territory calling subscriber's current place according to the MSC address information in the IDP message, the VMSC that determines the current place of calling subscriber then is nearest apart from MGCF4.The gsmSCF that then has the DRF function should include the routing iinformation of MGCF4 among the IMRN of distribution when distributing IMRN, make VMSC to route the call to MGCF4 according to this IMRN.Here, be called IMRN4 if will include the IMRN of MGCF4 routing iinformation, then the structure of IMRN4 can be MGCF4 route prefix+DTFPSI+ Call Reference Number.Certainly, the present invention does not limit the position of MGCF4 routing iinformation in IMRN.Then, the gsmSCF with DRF function operates the VMSC that is issued to the current place of calling subscriber in the mobile network circuit switching (CS) territory with IMRN4 as new called party information by CAMELconnect.

Like this, in step 1-4, when VMSC analyzes the new called party information that receives, just can route the call among the MGCF4 nearest according to the MGCF4 routing iinformation that comprises among the IMRN4 with it.Thereby the DTM that has reduced the calling controlling schemes introducing of static anchor point carries circuitous path.

When IMRN constitute the mode of " MGCF route prefix+DTF PSI+ Call Reference Number " time, make VMSC receive IMRN in the CAMEL connect operation, when the new called party information that receives is analyzed, just can route the call to corresponding M GCF by analysis to the routing iinformation of the MGCF that comprises among the IMRN, and MGCF can remove the routing iinformation of the MGCF that comprises among the IMRN, as deduct the IMRN route prefix, IMRN is reverted to the mode of " DTF PSI+ Call Reference Number ", like this, call out in the subsequent process and all will handle according to description of the prior art, to step 1-7, can not have influence on the relevant treatment of other entities as the step 1-5 among background technology Fig. 1.

Method two: among Fig. 2, the UE in mobile network circuit switching (CS) territory is triggered to the AS with DTF function in the IMS territory with this calling subscriber's real call information by USSD mechanism.

In step 2-1, UE makes a call, called party information in the calling is for pointing to the DTF PSI of the AS with DTF function, here point to the DTF PSI of the AS with DTF function, be IMRN, in calling, be carried into MSC by UE, but further, this IMRN can be provided by AS with DRF function to UE.AS with DRF function is when UE provides IMRN, need consider the MSC address information at the current place of UE, the VMSC that determines the current place of calling subscriber then is nearest apart from MGCF4, the gsmSCF that then has the DRF function is when distributing IMRN, the routing iinformation that should include MGCF4 among the IMRN that distributes, as the AS with DRF function distributes IMRN4 and provides to UE, and the structure of IMRN4 can be MGCF4 route prefix+DTF PSI.

In step 2-4, before VMSC distributes the required Radio Resource of calling, according to the MGCF4 route prefix that comprises among the called party information IMRN4, the MGCF4 of VMSC in the IMS network sends IAM message, and the calling that receives among the step 2-1 is routed to the IMS territory.

The processing of MGCF in the follow-up IMS territory is with method one.

Method three: among Fig. 3, the UE in the IMS territory is triggered to the AS that has the DTF function in the IMS territory with the calling subscriber's in mobile network circuit switching (CS) territory real call information by SIP Notify mechanism.

In step 3-1, UE makes a call, called party information in the calling is for pointing to the DTF PSI of the AS with DTF function, here point to the DTF PSI of the AS with DTF function, be IMRN, in calling, be carried into MSC by UE, but further, this IMRN can be provided by AS with DRF function to UE.AS with DRF function is when UE provides IMRN, need consider the MSC address information at the current place of UE, the VMSC that determines the current place of calling subscriber then is nearest apart from MGCF4, the gsmSCF that then has the DRF function is when distributing IMRN, the routing iinformation that should include MGCF4 among the IMRN that distributes, as the AS with DRF function distributes IMRN4 and provides to UE, and the structure of IMRN4 can be MGCF4 route prefix+DTF PSI.

In step 3-4, before VMSC distributes the required Radio Resource of calling, according to the MGCF4 route prefix that comprises among the called party information IMRN4, the MGCF4 of VMSC in the IMS network sends IAM message, and the calling that receives among the step 3-1 is routed to the IMS territory.

The processing of MGCF in the follow-up IMS territory is with method one.

Method four: among Fig. 4, user for mobile network circuit switching (CS) territory does called, when calling routes to GMSC in called subscriber's the ownership mobile network circuit switching (CS) territory, GMSC uses CAMEL mechanism will receive the calling that comes from Calling Side and is toggled to when having the gsmSCF of DRF function in the mobile network circuit switching (CS) territory, and what trigger here is the callee side CAMEL Subscription Information.

At step 4-6, the gsmSCF with DRF function generates a routing number IMRN (IMS Routing Number) who points to the AS with DTF function in the IMS territory, makes GMSC route the call on this DTF according to this routing number.When the gsmSCF with DRF function distributes IMRN, need be toggled to the GMSC positional information that has the gsmSCF of DRF function in the mobile network circuit switching (CS) territory and distribute according to current mobile network circuit switching (CS) territory is called out, as the gsmSCF with DRF function is that DP12 knows that this CAMEL is the mutual of a callee side user alternately according to the triggering Detection Point among the CAMEL message id P that receives among the step 4-3, and can judge the positional information of GMSC in the called subscriber's home network of mobile network circuit switching (CS) territory according to the MSC address information in the IDP message, the GMSC that determines then in called subscriber's home network is nearest apart from MGCF4.The gsmSCF that then has the DRF function should include the routing iinformation of MGCF4 among the IMRN of distribution when distributing IMRN, make GMSC to route the call to MGCF4 according to this IMRN.Here, be called IMRN4 if will include the IMRN of MGCF4 routing iinformation, then the structure of IMRN4 can be MGCF4 route prefix+DTF PSI+ Call Reference Number.Certainly, the present invention does not limit the position of MGCF4 routing iinformation in IMRN.Then, the gsmSCF with DRF function operates the GMSC that is issued to called subscriber's ownership in the mobile network circuit switching (CS) territory with IMRN4 as new called party information by CAMEL connect.

Like this, in step 4-7, when GMSC analyzes the new called party information that receives, just can route the call among the MGCF4 nearest according to the MGCF4 routing iinformation that comprises among the IMRN4 with it.Thereby the DTM that has reduced the calling controlling schemes introducing of static anchor point carries circuitous path.

The processing of MGCF in the follow-up IMS territory is with method one.

Method five: among Fig. 5, user for mobile network circuit switching (CS) territory does called, when calling routes to GMSC in called subscriber's the ownership mobile network circuit switching (CS) territory, GMSC uses signaling catching mechanism will receive the calling that comes from Calling Side and is toggled to when having the SRF of DRF function in the mobile network circuit switching (CS) territory

Generate a routing number IMRN (IMS Routing Number) who points to the AS in the IMS territory at step 5-5, SRF with DRF function, make MSC route the call on this DTF according to this routing number with DTF function.When the gsmSCF with DRF function distributes IMRN, need distribute according to the GMSC positional information of initiating SRI message, as the gsmSCF with DRF function judges the positional information of GMSC in the called subscriber's home network of mobile network circuit switching (CS) territory according to the GMSC address information in the SRI message that receives among the step 5-5, and the GMSC that determines then in called subscriber's home network is nearest apart from MGCF4.The SRF that then has the DRF function should include the routing iinformation of MGCF4 among the IMRN of distribution when distributing IMRN, make GMSC to route the call to MGCF4 according to this IMRN.Here, be called IMRN4 if will include the IMRN of MGCF4 routing iinformation, then the structure of IMRN4 can be MGCF4 route prefix+DTF PSI+ Call Reference Number.Certainly, the present invention does not limit the position of MGCF4 routing iinformation in IMRN.Then, the function with SRF imitation HLR of DRF function is returned SRI-Ack message to GMSC, in this SRI-Ack message IMRN is sent to GMSC as called routing iinformation.

Like this, in step 5-6, when GMSC analyzes the called routing iinformation that receives, just can route the call among the MGCF4 nearest according to the MGCF4 routing iinformation that comprises among the IMRN4 with it.Thereby the DTM that has reduced the calling controlling schemes introducing of static anchor point carries circuitous path.

The processing of MGCF in the follow-up IMS territory is with method one.

When circuit commutative field is the PSTN network, similar based on the embodiments of the invention processing mode with the embodiment processing mode under the situation of above-mentioned mobile network circuit switching (CS) territory, be not described in detail at this.

Routed path control system provided by the invention as shown in Figure 7.

Among Fig. 7, routed path control system of the present invention comprises: IMS territory network entity determination module and routing module.

IMS territory network entity determination module: for the calling that need route to the IMS territory from circuit commutative field, IMS territory network entity determination module determines the network entity information in the IMS territory of the correspondence that calling need route to according to predetermined policy, the network entity in this IMS territory can be MGCF.Initial call that callee side is initiated in the initial call that IMS territory network entity determination module can be initiated according to Calling Side in the circuit commutative field respectively, the circuit commutative field and the different corresponding methods of employing such as calling triggering mode are determined IMS territory network entity information, further, network entity determination module in IMS territory offers routing module with the IMS territory network entity information of determining.Description in detailed process such as the above-mentioned method is not described in detail at this.IMS territory network entity determination module can be arranged in the AS in IMS territory, as is arranged in the AS with DRF function in IMS territory, also can be arranged in the entity of circuit commutative field, among the gsmSCF as mobile network circuit switching (CS) territory.

Routing module:, route the call to corresponding entity in the IMS territory, as corresponding M GCF according to the IMS territory network entity information that IMS territory network entity determination module provides.It is multiple that IMS territory network entity determination module provides the method for IMS territory network entity information to have to routing module, operate the called party information parameter as passing through CAMEL connect, or the MSRN parameter carried IMS territory network entity information in the SRI-Ack message.Description in detailed process such as the above-mentioned method is not described in detail at this.

Routing module can be arranged in the entity of circuit commutative field, as it is medium to be arranged in the switching center in mobile network circuit switching (CS) territory such as VMSC or GMSC.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.

Claims

1. a route path control method is characterized in that, for the calling that need route to the IMS territory from circuit commutative field, this method may further comprise the steps:

The positional information of the network entity that a, application server make a call according to circuit commutative field is chosen the network entity in the IMS territory that receives described calling nearby;

2. a kind of route path control method as claimed in claim 1 is characterized in that, described need comprising from the calling that circuit commutative field routes to the IMS territory: need carry out the calling of the circuit commutative field of grappling process the IMS territory.

3. a kind of route path control method as claimed in claim 2, it is characterized in that, described application server is: have the application server of inter-domain routing function in the IMS territory, or have the gsmSCF of inter-domain routing function in the mobile network circuit switching (CS) territory, or have the SRF of inter-domain routing function.

4. as claim 1,2 or 3 described a kind of route path control methods, it is characterized in that described step a further comprises:

A2, described application server basis routing policy are nearby determined the information that needs route the call to the MGCF in the IMS territory.

5. a kind of route path control method as claimed in claim 4 is characterized in that:

Initiation initial call in the described mobile network circuit switching (CS) territory is: when Calling Side is the CS territory, VMSC receives the calling of initiating behind the call setup message of UE, or callee side is when being the CS territory, and GMSC is after receiving the calling that comes from Calling Side, to the calling of initiating after the called party information analysis;

6. a kind of route path control method as claimed in claim 5 is characterized in that, described step a2 specifically comprises:

Described application server obtains the positional information of Calling Side VMSC in the mobile network circuit switching (CS) territory, and determines the nearest MGCF of the described VMSC of distance according to routing policy nearby; Or

Described application server obtains calling subscriber's current position information in the mobile network circuit switching (CS) territory, and determines the current nearest MGCF of VMSC of the described calling subscriber of distance according to routing policy nearby; Or

Described application server obtains the positional information of callee side GMSC in the mobile network circuit switching (CS) territory, and determines the MGCF of described GMSC correspondence according to predetermined routing policy nearby.

7. a kind of route path control method as claimed in claim 6 is characterized in that, the step that described application server obtains Calling Side VMSC positional information in the mobile network circuit switching (CS) territory comprises:

8. a kind of route path control method as claimed in claim 6 is characterized in that, the step that described application server obtains callee side GMSC positional information in the mobile network circuit switching (CS) territory comprises:

9. a kind of route path control method as claimed in claim 6 is characterized in that, described step b specifically comprises:

10. a kind of route path control method as claimed in claim 9 is characterized in that:

Described IMRN comprises: MGCF routing iinformation and DTF PSI and call reference number.

11. a kind of route path control method as claimed in claim 9 is characterized in that:

Described IMRN comprises: MGCF routing iinformation and DTF PSI.

12. a kind of route path control method as claimed in claim 1 is characterized in that, described step a also comprises:

13. a routed path control system is characterized in that, comprising:

Be positioned at the IMS territory network entity determination module of application server: for the calling that need route to the IMS territory from circuit commutative field, the positional information of the network entity that makes a call according to circuit commutative field is chosen the network entity in the IMS territory that receives described calling nearby, and described IMS territory network entity information is offered routing module;

14. application server, it is characterized in that, be provided with IMS territory network entity determination module in the described application server, for the calling that need route to the IMS territory from circuit commutative field, the positional information of the network entity that described IMS territory network entity determination module makes a call according to circuit commutative field is chosen the network entity in the IMS territory that receives described calling nearby, and the network entity information in the described IMS territory is offered network entity in the circuit commutative field.

15. switching center, be arranged in the circuit commutative field, it is characterized in that, be provided with routing module in the described switching center, the IMS territory network entity information that described routing module provides according to application server, route the call to corresponding network entity in the IMS territory, the network entity in the IMS territory of the described calling of reception that the positional information of the corresponding network entity network entity that to be described application server make a call according to circuit commutative field is chosen in the described IMS territory nearby.